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trangle986
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cho tu giac ABCD co dien tich S=32 tong AB+BD+DC=16 tinh AD
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bai 2 cho tam giac ABC voi cac canh la a=5,b=6,c=7 tinh khoang cach giua cac giao diemcac duong phan giac va trong tam tam giac
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bai 2 cho tam giac ABC voi cac canh la a=5,b=6,c=7 tinh khoang cach giua cac giao diemcac duong phan giac va trong tam tam giac